I know what I’d tell them

Bear in mind that this is in England, land of fast-eroding freedom:

Attendants in a British park have been told to confront adults who enter without children, in hopes of catching any suspected pedophiles, the Daily Mail reported Wednesday.
Wardens in Telford Town Park in Shropshire, will stop and question anyone who is not accompanied by kids. The park council calls the policy a “commonsense approach” to protect children within the 420-acre recreational area.
Some park goers have accused the council of “authoritarian madess,” saying the policy will unnecessarily panic parents about the dangers their children face.

If a police department tried that here, the correct response to their probing questions would be “mind your own fucking business, buddy, I have as much right to be in this park as anyone else.” And then a false-arrest lawsuit would undoubtedly follow their reaction 🙂
(Whoops…almost fergot the link.)